We need to replace the IntegerField Contribution.contributionnumber

Contribution models have a unique IntegerField, contributionnumber

It is created like this:

contribution_max_nb = Contribution.objects.aggregate(Max('contributionnumber'))['contributionnumber__max']
if contribution_max_nb is None:
    contribution_nb = 1

else:
    contribution_nb = contribution_max_nb + 1

    contributionInstance = instance.contributions.create(
        ...
        contributionnumber = contribution_nb
    )
    contributionInstance.save()

The issue with this is that it's replicating the function of the primary key, and it has a race condition if I run this many times at once

The best solutions would be:

• To replace this with a CharField - we can then use the Python function uuid.uuid4() to create unique contribution numbers like c966e5e2-e4e9-4468-91f3-2f4cc2471c93
• To remove the contributionnumber field altogether and use the built-in primary key property (contribution.pk)